/* ============================================
   Generador de Horarios Escolares - Modern SaaS Design System
   ============================================ */

:root {
    /* Light Theme */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --sidebar-width: 280px;
    --sidebar-collapsed: 80px;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    min-height: 100vh;
    line-height: 1.6;
    transition: var(--transition);
}

/* ============================================
   Sidebar Navigation
   ============================================ */

.navbar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    transition: var(--transition);
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.navbar.collapsed {
    width: var(--sidebar-collapsed);
}

.nav-brand {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 2rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0 0.5rem;
    line-height: 1.3;
}

.nav-brand::before {
    content: '📅';
    font-size: 1.5rem;
    flex-shrink: 0;
    margin-top: 0.1rem;
}

.navbar.collapsed .nav-brand span {
    display: none;
}

.nav-menu {
    list-style: none;
    margin-bottom: 1.5rem;
}

.nav-menu li {
    margin-bottom: 0.25rem;
}

.nav-menu a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-menu a:hover {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    transform: translateX(4px);
}

.nav-menu a.active {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: var(--shadow-md);
}

.nav-menu a::before {
    font-size: 1.25rem;
}

.nav-menu a[data-page="inicio"]::before { content: '🏠'; }
.nav-menu a[data-page="instituciones"]::before { content: '🏛️'; }
.nav-menu a[data-page="profesores"]::before { content: '👨‍🏫'; }
.nav-menu a[data-page="aulas"]::before { content: '🏫'; }
.nav-menu a[data-page="grupos"]::before { content: '👥'; }
.nav-menu a[data-page="materias"]::before { content: '📚'; }
.nav-menu a[data-page="horarios"]::before { content: '📆'; }
.nav-menu a[data-page="vista-profesor"]::before { content: '🧑‍🏫'; }
.nav-menu a[data-page="vista-aula"]::before { content: '🚪'; }

.navbar.collapsed .nav-menu a span {
    display: none;
}

.nav-section {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.nav-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 0 1rem;
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
}

.navbar.collapsed .nav-section-title {
    display: none;
}

.nav-tree {
    list-style: none;
    max-height: 300px;
    overflow-y: auto;
}

.nav-tree-item {
    padding: 0.5rem 1rem 0.5rem 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: var(--transition);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-tree-item:hover {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
}

.nav-tree-item.active {
    background: var(--accent-primary);
    color: white;
    font-weight: 600;
}

.navbar.collapsed .nav-tree-item {
    padding: 0.5rem;
    text-align: center;
}

/* Theme Toggle */
.theme-toggle {
    margin-top: auto;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.theme-toggle-btn {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.theme-toggle-btn:hover {
    background: var(--accent-primary);
    color: white;
    transform: scale(1.05);
}

.navbar.collapsed .theme-toggle-btn span {
    display: none;
}

/* ============================================
   Main Content
   ============================================ */

.container {
    margin-left: var(--sidebar-width);
    padding: 2rem;
    flex: 1;
    transition: var(--transition);
    width: calc(100% - var(--sidebar-width));
}

.navbar.collapsed ~ .container {
    margin-left: var(--sidebar-collapsed);
    width: calc(100% - var(--sidebar-collapsed));
}

/* ============================================
   Cards
   ============================================ */

.card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    animation: fadeIn 0.3s ease-in;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card h2 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.card h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: 1.25rem;
    font-weight: 600;
}

/* ============================================
   Forms
   ============================================ */

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
input[type="time"],
select,
textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    transition: var(--transition);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: inherit;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

input::placeholder {
    color: var(--text-muted);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    box-shadow: var(--shadow-sm);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #2563eb, #7c3aed);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-success {
    background: linear-gradient(135deg, var(--accent-success), #059669);
    color: white;
}

.btn-success:hover {
    background: linear-gradient(135deg, #059669, #047857);
}

.btn-danger {
    background: linear-gradient(135deg, var(--accent-danger), #dc2626);
    color: white;
}

.btn-danger:hover {
    background: linear-gradient(135deg, #dc2626, #b91c1c);
}

.btn-warning {
    background: linear-gradient(135deg, var(--accent-warning), #d97706);
    color: white;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* ============================================
   Tables
   ============================================ */

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

table thead {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
}

table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

table td {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-primary);
}

table tbody tr {
    transition: var(--transition);
}

table tbody tr:hover {
    background: var(--bg-tertiary);
}

table th[onclick] {
    cursor: pointer;
    user-select: none;
    transition: var(--transition);
}

table th[onclick]:hover {
    background: rgba(255, 255, 255, 0.1);
}

.sort-indicator {
    font-size: 0.7rem;
    margin-left: 0.25rem;
}

/* ============================================
   Schedule Grid (Modern Calendar View)
   ============================================ */

.schedule-container {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    overflow-x: auto;
}

.schedule-grid {
    display: grid;
    gap: 2px;
    background: var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    min-width: 800px;
}

.schedule-header {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    padding: 1rem;
    font-weight: 600;
    text-align: center;
    font-size: 0.95rem;
}

.schedule-time {
    background: var(--bg-tertiary);
    padding: 0.75rem;
    font-weight: 600;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-width: 100px;
}

.schedule-cell {
    background: var(--bg-secondary);
    padding: 0.75rem;
    min-height: 80px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.schedule-cell:hover {
    background: var(--bg-tertiary);
    transform: scale(1.02);
    z-index: 10;
    box-shadow: var(--shadow-md);
}

.schedule-cell.occupied {
    color: white;
    font-weight: 500;
    border-radius: var(--radius-sm);
    margin: 2px;
}

.schedule-cell.occupied:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.schedule-cell .subject-name {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.schedule-cell .teacher-name {
    font-size: 0.75rem;
    opacity: 0.9;
}

.schedule-cell.receso {
    background: repeating-linear-gradient(
        45deg,
        var(--bg-tertiary),
        var(--bg-tertiary) 10px,
        var(--border-color) 10px,
        var(--border-color) 20px
    );
    color: var(--text-muted);
    font-style: italic;
    cursor: not-allowed;
}

.schedule-cell[draggable="true"] {
    cursor: grab;
}

.schedule-cell[draggable="true"]:active {
    cursor: grabbing;
}

.schedule-cell.drag-over {
    background: rgba(59, 130, 246, 0.2);
    border: 2px dashed var(--accent-primary);
}

/* ============================================
   Instance Panel (Draggable Items)
   ============================================ */

.instance-panel {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    max-height: calc(100vh - 200px);
    overflow-y: auto;
    position: sticky;
    top: 2rem;
}

.instance-panel h3 {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.instance-filter {
    margin-bottom: 1rem;
}

.instance-filter input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    transition: var(--transition);
}

.instance-filter input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.instance-item {
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    border-radius: var(--radius-md);
    cursor: grab;
    transition: var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: white;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

.instance-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.instance-item:active {
    cursor: grabbing;
}

.instance-item.placed {
    opacity: 0.4;
    cursor: not-allowed;
    text-decoration: line-through;
}

.instance-item .instance-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.instance-item .instance-name {
    font-size: 0.9rem;
    font-weight: 700;
}

.instance-item .instance-teacher {
    font-size: 0.75rem;
    opacity: 0.9;
}

.instance-item .instance-check {
    font-size: 1.25rem;
}

.instance-summary {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 2px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.instance-summary strong {
    color: var(--accent-primary);
    font-size: 1.1rem;
}

/* ============================================
   Stats Dashboard
   ============================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-card h3 {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.stat-card .stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    line-height: 1;
}

.stat-card .stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.stat-card .stat-icon {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 2rem;
    opacity: 0.2;
}

/* ============================================
   Toast Notifications (SweetAlert2 Custom)
   ============================================ */

.swal2-popup {
    border-radius: var(--radius-lg) !important;
    box-shadow: var(--shadow-xl) !important;
}

.swal2-toast {
    box-shadow: var(--shadow-lg) !important;
    border-radius: var(--radius-md) !important;
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.fade-in {
    animation: fadeIn 0.3s ease-in;
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

/* ============================================
   Utilities
   ============================================ */

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--accent-success); }
.text-warning { color: var(--accent-warning); }
.text-danger { color: var(--accent-danger); }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
    .navbar {
        width: var(--sidebar-collapsed);
    }
    
    .container {
        margin-left: var(--sidebar-collapsed);
        width: calc(100% - var(--sidebar-collapsed));
        padding: 1rem;
    }
    
    .nav-menu a span,
    .nav-section-title,
    .nav-brand span {
        display: none;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .navbar,
    .theme-toggle,
    .btn,
    .actions,
    .instance-panel,
    #btnAutocompletar,
    #btnGenerar,
    #btnReset,
    #btnExportar {
        display: none !important;
    }
    
    .container {
        margin: 0;
        padding: 0;
        width: 100%;
    }
    
    .card {
        box-shadow: none;
        border: none;
        page-break-inside: avoid;
    }
    
    .schedule-cell.occupied {
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
        color-adjust: exact !important;
    }
}

/* ============================================
   Scrollbar Styling
   ============================================ */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ============================================
   Loading States
   ============================================ */

.skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--border-color) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    border-radius: var(--radius-sm);
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* ============================================
   Badges
   ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-primary {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-primary);
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-success);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent-warning);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-danger);
}

/* ============================================
   Modal Enhancements
   ============================================ */

.modal-backdrop {
    backdrop-filter: blur(4px);
}

.modal-content {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    animation: fadeIn 0.2s ease-out;
}